Carbureter.



L. H. VAN BRIGGLE.

cAaunHEn.

APPLICATION FILED FEB. 9| 1916.

Patented July 23, 1918.

INVEHTUI? WITNESSES:

LILBURN HOWARD VAN BRIGGLE, OF INDIANAPOLIS, INDIANA.

CARBURETER.

Specification of Letters Patent.

Patented July 23, 1918.

Application filed February 9, 1916. Serial No. 77,127.

To all enh/1m it may concern:

lie it known that I, LinnUuN HowAnD Y AN BniooLu, a citizen of the United States, residing at Indianapolis, in the county o Marion and State of Indiana, have invent ed a new und useful Curbureter, of which the following` is a specification.

lt is the object of my invention to provide a carburetor which produces an intimate mixture of the fuel and air; which will produce an opening of the fuel control valve upon the opening of the throttle, with the movements of the throttle and the fuel control valve relatively adjustable; which can cut oil' the supply of both primary and secondary air together for obtaining` a rieh mixture at starting.y and by such eulting off, though preferably only at the last part thereof, produces an opening of the. fuel control valve to obtain a further enrichment of the mixture; in which the fuel. control valve may be opened independently by either the opening of the throttle or the cutting olf of the air supply;` which produces :i swirling movement of the primary nir` thereby finely atomizing the liquid fuel and preventing any loss thereof; and which may be adjusted to compensate for varia.- tions in the number of cylinders and in the suction obtained in different engines.

The accompanying drawing illustrates my invention. Figure 1 is a partial elevation and partial vertical central section of a carbureter embodying my invention; Fig. 2 is a reduced section on the line 2---2 of Fig. 1; and Fig. 3 is a partial section on the line 3-3 of Figs. 1 and 2.

The main body 10 of the carbureter has e central dependent tube 11 which at its upper end opens into a horizontal passageway 12 at un intermediate point of the latter. This horizontal passageway at one side (the left) is provided with a downwardly opening, automatic secondary air vulve 13, which is spring-pressed upward by a spring 14 and is opened downward by the engine suction in accordance with the demands und is controlled in its movements by an air dashpot 15; and at its other side (the right) is turned upward and provided with a Harige 16 for connection to the, inlet manifold of the engine7 and has n butterliy throttle 17 mounted on a shaft 18 and operated by a connecting' rod 19 leading to any suitable control point.

A Venturi tube Q0 depends into the. central tube 11 and has a screw thread mounting 2l at the juncture of sueh central tube 11 with the horizontal assageway l2, so that the entrance from t e central tube 11 to such horizontal passageway 12 must be through the Venturi tube. A fuel nozzle 22 discharges upwardly Within the Venturi tube E() at approximately the most contract ed portion thereof, and receives its supply of fuel through a passageway 23 co1nmuo`1- eating with a fuel bowl 24 surroundingr the central stem 11 and-having .the fuel level therein controlled in the usual manner by a float valve 25. A needle valve 2G controls the outlet of the fuel nozzle 22, and projects centrally downward across the horizontal passageway 12 and along the axis of the Venturi tube Q0, its upper end extending through a. removable screw plug 27 and having an adjustable serew-threul mounting in one end of a lever 28 mounted on a pivot pin 29 on the main body 10. A spring 30 presses upward the other end of the lever 28. thus tending' to seat the needle valve 2f* A downward curved projection 31 from thi spriogqjiressed end of the lever '28 carries at its lower end a roller 32 which coperates with a rigid arc-shaped cam 33 having at one end a pivotal mounting 34 on un arm 35 fixed on the shaft 18 and at its other beine; provided with an undereut radial slot 3 6 which receives a ball 37 on the end of a screw 38 mounted in an arm 39 also fixed on the shaft 18, the two arms 35 and 39 con` veniently being extensions from a collar mounted on the shaft 18 so that by adjust ing such collar the two arms are adjusted together. By adjusting thescrew 38 the outside, convex surface of the rigid areshaped cam 33 may be made eccentrie of the shaft 18 by any desired amount, so that* when such shaft 18 is turned to vary the po Asize of auch pool.

adjustin the Screw 38. W'hcn a rich rnixture is esired for Starling. the operating rodA 5l pulled to shut ull' the primary and secondary air .fsu'lplies and linally to raise the needle valve 26 to increase the supply of fuel therefrom,

One or more overflow pipee` no are preferabluir provided at and project Slightly above the vbottom of the tube ll ,eo as to allow a small pool of fuel lo eolert but to limit the Hy reason ri ihrs, the Vfuel which condemn-f` 'alien the cugino is; stopped vflows, hach lo nui rolhzzte in the bottom of the tube lll, und when the engine is next etal-teil this fuel in ih-,kuil up hy the air and enriches the n'iixture. The orertlow pipe or pipee admit :t relatively email amount of air during normal fuieration, hut #hir-1 :air @only lncrrafma the quuntitjy et' primaar air.

lY claim au my invention:

1i [n a carlnneter. the minhiualion of an upright Venturi tule; a mixture paesaggi"- info which Said Venturi Tube l hargne np warclly, 'miel mixture paenne liariinc an :un (omelie wconflary air murs: for admitting secmulery air therrintr in in "rdanee with the euctioln ay .fuel nozzle il charging upwardly Within Said Venturi tube above the lower end thereof, an outer tube ,surrounding said Venturi tube and prmided with a closed lower end from which the lower end of the TVenturi tube is upwardlyv spaced, and a 'n r3 air supply paesana discharging outer tube taugentiallr around said. Venturi tube at e point higher than the lower ruil ol' said Venturi tube so that the air ie given :i helical or swirling' motion around the Venturi tube before entering it and parlare under the lower edge of Said lf'enturi tube and upward into the Venturi tulle with n wonuuwnre oi' the iieliial or au irling motion.

In a iarlnu'etcn the combination of a mixing chamber, a primary air passage lead ingr ther-cinto, a fue] nozzle rlieeharging Within said primary air passage, au auloinaie Secondary air inlet saire opening-into said mixing rhaulber,r a control valve in the prinni1 \"air inlet ronduit1 and nir-anaV operated by the clfvsvainflof said control Valve for fori ing closed the secondary air valve from any open position and positively blocking the opening' nii laid seconder-j,4 air ralr'c.

l. in a carburetor, ille combination of a 1{enturi tube, u mixture passage into which :said Venturi tube discharges, L Vid inixture iuisaage having' an :rinomati-s secondary air valve for: iulinii'ing emendar)v air thereinto in accordance with the auction, a fuel nozzle discharging wilhn and liarwccn the ends of said Venturi tube. au outer tube surroundn ingr will. Yr'rcuuri tube and spaced from the inlet elnl et' the lattenanil a primary air supply conduit discharging into said outer 65 tube tangentially around said Venturi tube i at a point removed from the inlet end of the latter, so that the air is given a helical or swirling motion around the 'Venturi tuhc beffn-e entering it and whilc traveling up 7'0 through it. i

4,. In earl'iureter, thc combination of a lVenturi tube, a mixture passage into which `said Venturi tube discharges, a fuel nozzle discharging within und between the ends of Said Venturi tube, an outer tube surround ing said Venturi tube and spaced from the inlet end oli the latter, and a primary air supply conduit discharging into said outer tube tangcutially around said Venturi tube ai; uY point removed from the inlet end of ille latter, so that the air is given a helical or auirline motion around the Venturi tube before. entering it and while traveling up lill'mlgl S5 IS. ln a carburetor, the combination of a l'fcnxuri tube. a mixture pz'xnsage into which Said Venturi tube dischargee, a `fuel nozzle fiisrluirgginu' uithiu and between the ends of aid Venturi ruhe, an outer tube surround- 90 ing said Venturi lube and spaced from the inletlennl of the latterrj and a primar)Y ait Supply ronduit dischargin;r into laid outer tube. tnngeutially around said Venturi tulle at a point. removed from the inlet end ot' the 95 lattery so that the air is given a helical mo tion around the Venturi tube before eutcrin; it and while traveling up through it, sai primaryv air conduit where it discharges into said outer tube being inclined ohliquely toA le ward the inlet end ot the Venturi tube so as to give an initial axial component of motion to the helical stream of air around the Venturi lube.

il. In a earbureter, the combination ol' a 105 TUeuturi tube, a mixture passage into which said Venturi lulu, discharges, a fuel nozzle discharging within said Venturi tube, an outer tube surroiuuling said Venturi tulle and spaced from the inlet end of the latter, and a primary air supply conduit discharging, into said outer tube tangcutially around said Venturi tube at a point removed from( the inlet end of the latter, so that the air` is given. a helical motion around the Voir Il luri tube before entering it and while traveling' up through it. Said primaryv air supply `conduit where it discharges into said outer tubo having a greater eroesccional dimension transverse lo the axis of aid outer 120 lube than lougitiulinally or' yeuch axis.

7. In a carburetor, the combination of an upright Venturi tube, a mixture passage into which ,said Venturi tube discharges up- Wardly, Said mixture passage having an automatic uraondary air valve for admitting aco-indem; air thcrcinto in accordance with the Suction, a fuel nozzle discharging up wardly within said Venturi tube above the lower end thereof, an outer tube surrounding said Venturi tube and provided with a closed lower end from which the lower end of the Venturi tube is upwardly spaced, said Venturi tube being hung,r from its upper end and being axially adjustable vertically to vary the space between lhe lower end oi' such Venturi tube and the bottom of Said outer tube, and a primary air supply passage discharging into said outer tube tangentially around said Venturi tube at a point higher than the lower end olf lquid Venturi tube, so that the air given a helical or swirling,r motion around the Venturi lube before entering it and passes under the lower edge of Said Venturi tube and upward into the Venturi tn bp with a continuance of the helical or swirling; motion.

S. 1n a carburetor, the combination ol' a mixing chamber, a primary air passage leading thereinto, a fuel nozzle diaehargring within said primary air passage, an automatic secondary air inlet valve opening into said mixing rhanlber, a control valve in the primary air inlet conduit, and means operated by the closing' ol Said eontrol valve for forring cloned the secondary air valve from any open position and. positively blot-king; the opening of said Secondary air valve, .said control valve being `epriiig-pi'eeseil lo open position.

i). In a earbureter, the combination of a mixingr chamber, a primary air passage leading thereinto, a fuel nozzle discharging within said primary air passage, an automatie Secondary air inlet valve opening into Iaid miningr chamber, a control valve in the primary all' inlet conduit, nieane o ierated bythe closing of Said control valve iior preventing the opening of said secondary air valve, a needle valve controlling the outlet of Said fuel nozzle, and means operated by the latter part only of the closing move ment ol said control valve for inf'reaaingr the opening of said needle valve.

10. In a carburetor, the combination of a mixing chan'iber, a primary air passage leadingr thereinto, a fuel nozzle discharging Within said primary air passage, an automatic secondary air inlet valve opening into said mixing chamber, a control valve in the rimary air inlet conduit, means o erated y the closing of said control valve or preventing the opening of said secondary `air valve, said Qontrol Valve being,r spring pressed to open position, a needle valve controllingl the outlet of said fuel nozzle, and means operated by the latter part only of the closingr movement of Said control valve for increaeing the opening of said needle Valve.

11. In a carburetor, the combination of a mixing chamber, a primary air passage leading' thereinto, a fuel nozzle discharging within said primary air passage, an automatic secondary air inlet valve opening into said mixing chamber, a control. valve in the primar f air inlet conduit, means operated by the closing of said control valve for preventing the opening oi said secondary air valve, a needle 'valve controlling the outlet of said fuel nozzle, and means operated by the closing movement ol said control valve ior increasing the opening of said needle valve.

l2. In a carburetor, the eombination of a mixing chamber, a primary air passage leading thereinto, a fuel nozzle discharging within Said primary air passage, an autowmatic Secondary air inlet valve opening into Said ,mixing chamber, a mntrol valve in'the primary air inlet conduit, means: operated by the closing of said control valve Jfor preventing the opening olI said serond ary air valve, Said control val ve being springpressed to open position, a needle valve con-` trolling the outlet of Said fuel. nozzle. and means operated by the closing movement o'l mid control valve for increasing lhe opening?? ol' Ieaid needle valve.

I3. In a carburetor, the eonlbination ol' an upright Venturi tube, a mixture passage into which Asaid Venturi lube discharges upwardly, a 'fuel nozzle discharging upwardly within said Venturi tubrabove the lower end thereof, an outer tube sin'rom'uling' .said Venturi tube and provided with a closed lower end from which the lower end of the Venturi tube upwardly spared, and a primary air supply paas-age hechar-ging into said outer tube tangentially around Said Venturi tube al a point higher than the. lower end of Said Venturi tube, so that the air is given a helical or awirlingr motivi around the Venturi tubeI before entering it and paaeee ander the lower edge of lSaid Venturi tube and upaard into the Venturi tube with a eontiuuamfe ol' tbe helical or awirling motion.

li. ln a rarlnn'eteixy the minbination ol a upright Venturi tube, a mixture passage into which said Venturi tube discharges upwardly, a fue] nozzle discharging upwardly within said Venturi tube above the. lower end thereof, an outer tube surrollnding said Venturi tube and provided with a cloned lowe;` end from which the lower end ofthe Venturi tube is upwardly spaced, said Venturi tube being hung from its upper end and being;r axially adjustable vertically to vary the space between the lower end of such Venturi tube and the bottom of Said outer tube, and a primary air Supply paru sage discharging into said outer tube tang-en tially around said Venturi tube at a point higher than the lower end of said Venturi tube, so that the air is given a helical or swirling motion around the Venturi tube before entering it and pasees under the lower edge of said Venturi tube and upward into the Venturi tube with a continuance of the helical or swirlingr motion.

15. In a carbureter, the combination of. a mixing chamber, a fuel nozzle discharging fuel thereinto, a needle valve controlling the supply of fuel from said fuel nozzle, said mixingr chamber heilig provided with an air inletopening, a throttle controllingr the discharge of themiXture from said mixing chamber, manually operated means for cutting oli' the supply of air to said air inlet opening, and means for opening said needle valve to increase the supply of fuel independently by the opening of the throttle and by the operation of said manually operated means.

1G. In a carburcter, the combination of au' upright Venturi tube, a mixture passage into which said Venturi tube discharges upwardly, said mixture passage having an zur tomatic secondary air valve for admitting secom'lary air thereinto in accordance with the suction, 4a fuel nozzle discharging upward ly within said Venturi tube above the lower end thereof, an outer tube surrounding said Venturi tube and provided with a closed lower end from which the lower end of the Venturi tube is upwardly spaced, and a primary air supply passage discharging into said outer tube tangentially around said Venturi tube at a point higher than the lower end of said Venturi tube, so that the air is given a helical or swirling motion around the Venturi tube before entering it and passes under the lower edge of said Venturi tube and upward into the Venturi tube with a continuance of the helical or swirling motion, said outer tube having an open overflow pipe opening into it Slightly aboxc 'its bottom but below the lower end of said Venturi tube.

17. In a carburetor, the combination of a mixing chamber having openings for the admission of primary and secondary air, a fuel nozzle for supplying fuel to the primary air admitted to the mixture chamber, a needle valle controlling the outlet from said fuel nozzle, valve means for shutting off the supply oi' primary and secondary air to said mixture chamber, and means operated by the shutting off of both Said primary and seroinlary air for causing,r the opening of said needle valve.

1H. In a carbureter, the combination of a mixing` chamber having openings for the admission of primary and secondaryV air, a fuel nozzle for supplying fuel to the primary air admitted to the mixture chamber, a needle valve controlling the outlet from said fuel nozzle, a valve controlling the supply of primary air, means operated by the closing of said primary air valve for producing an opening in said needle valve, a throttle for controlling the outlet of the mixture from.

said mixture chamber, and means operated by the opening of said throttle for opening said needle valve.

19. ln a carburetor, the combination of a mixing chamber having openings for the admission of primary and simondary air, a fuel' nozzle for supplying `fuel to the primary air admitted to the mixture chamber, a needle valve controlling the outlet from said fuel nozzle, an automatic air valve controlling the admission of secondary air to said mixture chamber, means .for preventing said automatic secondary air valve from opening, means operated by the operation of said opening-proventing means for producing an opening of said needle valve, a throttle for controlling the outlet of the mixture from said mixture chamber, and means operated by the opening of said throttle for opening said needle valve.

20. ln a arbureter, the combination of a mixing chamber having openings for the admission of primary and secondary air, a fuel nozzle for supplying fuel to the primary ail'` admitted to the .mixture chamber, a needle valve controlling the outlet. from said fuel nozzle, valve means for shutting off the supply of primary and secondary air to said mixture chamber, means Operated by the shutting olf of both said primary and Secondary air to cause the opening of said needle valve, a throttle for controlling the outlet of the mixture from said mixturek chamber, and means operated by the opening of said throttle for opening said needle valve.

2l. ln a carburetor, the combination of an upright Venturi tube, a mixture passage into which said Venturi tube discharges up wardly, a fuel nozzle discharging upwardly within and between the ends of said Venturi tube, an outer tube surrounding said Venturi tube and spaced :from the lower end of the latter and having an iniet openingr for primary air at a point above from the lower end of said Venturi tube, said outer tube having a closed lower end below the lower end of said Venturi tube, and said parts being provided with means for giving the air a helical motion around the Venturi tube before entering it.

22. In a carbureter, the combination of an upright Venturi tube, a mixture passage into which said Venturi tube discharges upwardly, a fuel nozzle discharging upwardly' within said Venturi tube above the lower end thereof, an outer tube surrounding said Venturi tube and provided with a closed lower end from which the lower end of the V nturi tube is upwardly spaced, and a {frimary air `supply passage dischargin into said outer tube tangentially aroun said Venturi tube at a point hi her than the lower end of said Venturi tu so that the air is given a helical or swirling motion around the Venturi tube before entering it In witness whereof, I have hereunto set and passes under the lower edge of said my hand at; Indianapolis, Indiana, this '17th 10 4Venturi tube and upward into the Venturi day of January, A. D. one thousand nine tube with a continuance of the helical or hundred und sixteen.

swirling motion, seid outer tube having an Y LILBURN HOWARD VAN BRIGGLE. open overflow pipe openingr into it slightly Witnesses: above its bottom but below the lower end of FRANK BrvENS,

said Venturi tube. ERNEST A. NULL. 

